Hi Ben,
For starters, you can not emulate the behavior of the wave file player. You must actually load it into the NION to get it to work, much like the meters, generators, etc.
Secondly, we have run into a few situations where 48k, 16 bit, mono/stereo files created by Protools and other editors do not seem to want to play in the NION's wave file player. I'm not sure exactly what the problem is, but I expect that it is related to some detail information in the header of the file. I highly recommend a program called "Easy CD-DA Extractor" to convert files from whatever format they are currently to 48k/16bit files for use in the NIONs. I use this on an old Pentium 4 computer in my office and it works really well. You can get a copy of it here: http://www.poikosoft.com/
I don't know what the issue is, exactly... but I do know when I run whatever files anyone has ever given me through Easy CD-DA Extractor and set the "Output Format:" to .wav (Standard) with 16-bit Mono (or Stereo) 48,000Hz, It has always worked well when I then loaded that output file into the NWare project. I have no idea what kind of "magic" it imparts, but it definitely changes something because the files that come out are generally ever so slightly smaller than the original file that went in.
If you would like me to give it a try, I'd be glad to run your file through the converter and make sure it works. I'm not sure if Poikosoft still offeres this software as a free trial, but that is what I have always used.
Josh Millward
Burnt Orange Studios